If you want to get an idea of how yesterday's three-team trade between the Detroit Tigers, Arizona Diamondbacks, and New York Yankees came together, the New York Post's Joel Sherman passes along the details he heard.
The way I heard how the Granderson trade began was that Arizona was trying to get Edwin Jackson at the GM Meetings and was told Max Scherzer was too little of a return, but felt Scherzer and Daniel Schlereth was too much. So Diamondbacks GM Josh Byrnes' first call was to Cashman because he assumed Granderson fit the Yankees' needs so ideally, and that the Yanks had resources that Detroit wanted.
That basically falls in line with what we'd heard previously, that the Tigers didn't think Scherzer alone was enough for Jackson. But it's interesting to see how one GM calls another one up with an idea that could get a deal done. We saw much the same thing last year in the three-team J.J. Putz deal, with Omar Minaya knowing he could get Franklin Gutierrez from Cleveland, which filled the centerfield need in Seattle.
(In a different article, Sherman explains that the Yankees jumped at the chance to get Curtis Granderson because they'd become quite familiar with him. Remember, it looked like the Tigers would be the Yanks' first-round playoff opponent, so they had a wealth of scouting material to consult when Granderson went on the trading block.)
Sherman also confirms what had been reported by several other outlets, that Dave Dombrowski was looking for players who either hadn't accumulated much major league service time (and a few seasons away from eligibility for salary arbitration) or were ready to play in the majors. (No three-to-four-year waits for prospects, thank you very much.)